I do admit it was wrong of me to suggest that you would not explore the options of the popup blocker if you did not have it configured. Maybe this is because th

I do admit it was wrong of me to suggest that you would not explore the options of the popup blocker if you did not have it configured. Maybe this is because the predicate nature of exploring the configuration space is less common on OS X. For example, when configuring Secondary Click for my Trackpad there is a dropdown that is enabled whether or not the checkbox is checked, allowing me to explore the options without checking the checkbox. Why disable these options? This seems like a better solution than having a Cancel button. I also suspect that the Cancel button is just masking another problem, that settings dialogs get nested so much that you forget what you changed.